sys/arch/hppa/include/pmap.h

   1 /*      $NetBSD: pmap.h,v 1.22 2009/11/11 16:08:31 skrll Exp $  */
   2
   3 /*      $OpenBSD: pmap.h,v 1.35 2007/12/14 18:32:23 deraadt Exp $       */
   4
   5 /*
   6  * Copyright (c) 2002-2004 Michael Shalayeff
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
  22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  27  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /*
  32  *      Pmap header for hppa.
  33  */
  34
  35 #ifndef _HPPA_PMAP_H_
  36 #define _HPPA_PMAP_H_
  37
  38 #include <sys/mutex.h>
  39 #include <machine/pte.h>
  40 #include <machine/cpufunc.h>
  41
  42 #include <uvm/uvm_pglist.h>
  43 #include <uvm/uvm_object.h>
  44
  45 #ifdef  _KERNEL
  46
  47 struct pmap {
  48         struct uvm_object pm_obj;       /* object (lck by object lock) */
  49 #define pm_lock pm_obj.vmobjlock
  50         struct vm_page  *pm_ptphint;
  51         struct vm_page  *pm_pdir_pg;    /* vm_page for pdir */
  52         volatile uint32_t *pm_pdir;     /* page dir (read-only after create) */
  53         pa_space_t      pm_space;       /* space id (read-only after create) */
  54         u_int           pm_pid;         /* prot id (read-only after create) */
  55
  56         struct pmap_statistics  pm_stats;
  57 };
  58
  59 /*
  60  * Flags that indicate attributes of pages or mappings of pages.
  61  *
  62  * We need two flags for cacheability because pages/mappings can be marked
  63  * uncacheable for two reasons,
  64  *
  65  *      1) A page's contents may change under our feet and can never be
  66  *         cacheable, e.g. I/O space, DMA buffers.
  67  *      2) A page has non-equivalent aliases and must be (temporarily)
  68  *         marked uncachable.
  69  *
  70  * A page that is marked PVF_NC can *never* be marked cacheable and will have
  71  * all mappings marked PVF_UNCACHEABLE. A page marked PVF_UNCACHEABLE only
  72  * is done so due to non-equivalent aliases this maybe removed is the non-
  73  * equivalent aliases are removed.
  74  *
  75  */
  76
  77 #define PVF_NC          0x2000                  /* pg is never cacheable */
  78
  79 #define PVF_MOD         PTE_PROT(TLB_DIRTY)     /* pg/mp is modified */
  80 #define PVF_REF         PTE_PROT(TLB_REFTRAP)   /* pg/mp (inv) is referenced */
  81 #define PVF_WRITE       PTE_PROT(TLB_WRITE)     /* pg/mp is writable */
  82 #define PVF_UNCACHEABLE PTE_PROT(TLB_UNCACHEABLE)
  83                                                 /* pg/mp is uncacheable */
  84
  85 #define pmap_is_aliased(pg)     \
  86         (((pg)->mdpage.pvh_attrs & PVF_NC) == 0 && \
  87          ((pg)->mdpage.pvh_attrs & PVF_UNCACHEABLE) != 0)
  88
  89 #define HPPA_MAX_PID    0xfffa
  90 #define HPPA_SID_MAX    0x7ffd
  91
  92 /*
  93  * DON'T CHANGE THIS - this is assumed in lots of places.
  94  */
  95 #define HPPA_SID_KERNEL 0
  96 #define HPPA_PID_KERNEL 2
  97
  98 struct pv_entry {                       /* locked by its list's pvh_lock */
  99         struct pv_entry *pv_next;
 100         struct pmap     *pv_pmap;       /* the pmap */
 101         vaddr_t         pv_va;          /* the virtual address + flags */
 102 #define PV_VAMASK       (~(PAGE_SIZE - 1))
 103 #define PV_KENTER       0x001
 104
 105         struct vm_page  *pv_ptp;        /* the vm_page of the PTP */
 106 };
 107
 108 extern int pmap_hptsize;
 109 extern struct pdc_hwtlb pdc_hwtlb;
 110
 111 /*
 112  * pool quickmaps
 113  */
 114 static inline vaddr_t hppa_map_poolpage(paddr_t pa)
 115 {
 116         return (vaddr_t)pa;
 117 }
 118
 119 static inline paddr_t hppa_unmap_poolpage(vaddr_t va)
 120 {
 121         pdcache(HPPA_SID_KERNEL, va, PAGE_SIZE);
 122
 123         return (paddr_t)va;
 124 }
 125
 126 #define PMAP_MAP_POOLPAGE(pa)   hppa_map_poolpage(pa)
 127 #define PMAP_UNMAP_POOLPAGE(va) hppa_unmap_poolpage(va)
 128
 129 /*
 130  * according to the parisc manual aliased va's should be
 131  * different by high 12 bits only.
 132  */
 133 #define PMAP_PREFER(o,h,s,td)   do {                                    \
 134         vaddr_t pmap_prefer_hint;                                       \
 135         pmap_prefer_hint = (*(h) & HPPA_PGAMASK) | ((o) & HPPA_PGAOFF); \
 136         if (pmap_prefer_hint < *(h))                                    \
 137                 pmap_prefer_hint += HPPA_PGALIAS;                       \
 138         *(h) = pmap_prefer_hint;                                        \
 139 } while(0)
 140
 141 #define pmap_sid2pid(s)                 (((s) + 1) << 1)
 142 #define pmap_resident_count(pmap)       ((pmap)->pm_stats.resident_count)
 143 #define pmap_wired_count(pmap)          ((pmap)->pm_stats.wired_count)
 144 #define pmap_update(p)
 145
 146 #define pmap_copy(dpmap,spmap,da,len,sa)
 147
 148 #define pmap_clear_modify(pg)   pmap_changebit(pg, 0, PTE_PROT(TLB_DIRTY))
 149 #define pmap_clear_reference(pg) \
 150                                 pmap_changebit(pg, PTE_PROT(TLB_REFTRAP), 0)
 151 #define pmap_is_modified(pg)    pmap_testbit(pg, PTE_PROT(TLB_DIRTY))
 152 #define pmap_is_referenced(pg)  pmap_testbit(pg, PTE_PROT(TLB_REFTRAP))
 153 #define pmap_phys_address(ppn)  ((ppn) << PAGE_SHIFT)
 154
 155 void    pmap_activate(struct lwp *);
 156
 157 void pmap_bootstrap(vaddr_t);
 158 bool pmap_changebit(struct vm_page *, u_int, u_int);
 159 bool pmap_testbit(struct vm_page *, u_int);
 160 void pmap_write_protect(struct pmap *, vaddr_t, vaddr_t, vm_prot_t);
 161 void pmap_remove(struct pmap *pmap, vaddr_t sva, vaddr_t eva);
 162 void pmap_page_remove(struct vm_page *pg);
 163
 164 static inline void
 165 pmap_deactivate(struct lwp *l)
 166 {
 167         /* Nothing. */
 168 }
 169
 170 static inline void
 171 pmap_remove_all(struct pmap *pmap)
 172 {
 173         /* Nothing. */
 174 }
 175
 176 static inline int
 177 pmap_prot(struct pmap *pmap, int prot)
 178 {
 179         extern u_int hppa_prot[];
 180         return (hppa_prot[prot] | (pmap == pmap_kernel()? 0 : TLB_USER));
 181 }
 182
 183 static inline void
 184 pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
 185 {
 186         if ((prot & UVM_PROT_WRITE) == 0) {
 187                 if (prot & (UVM_PROT_RX))
 188                         pmap_changebit(pg, 0, PTE_PROT(TLB_WRITE));
 189                 else
 190                         pmap_page_remove(pg);
 191         }
 192 }
 193
 194 static inline void
 195 pmap_protect(struct pmap *pmap, vaddr_t sva, vaddr_t eva, vm_prot_t prot)
 196 {
 197         if ((prot & UVM_PROT_WRITE) == 0) {
 198                 if (prot & (UVM_PROT_RX))
 199                         pmap_write_protect(pmap, sva, eva, prot);
 200                 else
 201                         pmap_remove(pmap, sva, eva);
 202         }
 203 }
 204
 205 #define pmap_sid(pmap, va) \
 206         ((((va) & 0xc0000000) != 0xc0000000) ? \
 207          (pmap)->pm_space : HPPA_SID_KERNEL)
 208
 209 /*
 210  * MD flags that we use for pmap_kenter_pa:
 211  */
 212 #define PMAP_NOCACHE    0x01000000      /* set the non-cacheable bit */
 213
 214 #endif /* _KERNEL */
 215
 216 #endif /* _HPPA_PMAP_H_ */